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Finding the Fourth Proportional to 131.67, 197.39 and 86.04

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Solution

The fourth proportional to 131.67, 197.39 and 86.04 is: 128.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.67 : 197.39 = 86.04 : x
  2. Step 2: Convert to fraction form
    131.67/197.39 = 86.04/x
  3. Step 3: Cross multiply
    131.67x = 197.39 × 86.04
  4. Step 4: Simplify right side
    131.67x = 16,983.01
  5. Step 5: Solve for x
    x = 16,983.01/131.67
  6. Step 6: Final answer
    x = 128.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.